The Defense Advanced Research Projects Agency said Northrop Grumman’s XRQ-73 hybrid-electric drone began flight testing in April at Edwards Air Force Base in California.
Northrop Grumman said the aircraft is intended to advance propulsion for lightweight autonomous aircraft by combining fuel efficiency, reduced emissions, and operational flexibility.

“This milestone is not just about a single flight,” Air Force Lt. Col. Clark McGehee, DARPA’s SHEPARD program manager, said in a statement. “The architecture proven by the XRQ-73 paves the way for new types of mission systems and delivered effects. We look forward to advancing this technology through the flight test program and delivering new capabilities for our warfighters.”
Newly released images show changes to the aircraft since 2024. The flying-wing drone now has two vertical stabilizers mounted near the wingtips, a small additional intake between two larger dorsal intakes, at least two blade antennas on top of the fuselage, and a forward-facing camera fairing at the front center of the fuselage. A large faceted fairing remains under the center section.
DARPA previously said the XRQ-73 is a Group 3 uncrewed aircraft weighing about 1,250 pounds and carrying “operationally representative … mission systems.” By U.S. military definitions, Group 3 drones weigh 55 to 1,320 pounds, fly between 3,500 and 18,000 feet, and reach 100 to 250 knots.